/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- * vim: set ts=8 sts=2 et sw=2 tw=80: * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* JavaScript module (as in, the syntactic construct) operations. */ #ifndef js_Modules_h #define js_Modules_h #include // uint32_t #include "jstypes.h" // JS_PUBLIC_API #include "js/CompileOptions.h" // JS::ReadOnlyCompileOptions #include "js/RootingAPI.h" // JS::{Mutable,}Handle #include "js/Value.h" // JS::Value struct JS_PUBLIC_API JSContext; class JS_PUBLIC_API JSObject; struct JS_PUBLIC_API JSRuntime; class JS_PUBLIC_API JSString; namespace JS { template class SourceText; } // namespace JS namespace mozilla { union Utf8Unit; } namespace JS { using ModuleResolveHook = JSObject* (*)(JSContext*, Handle, Handle); /** * Get the HostResolveImportedModule hook for the runtime. */ extern JS_PUBLIC_API ModuleResolveHook GetModuleResolveHook(JSRuntime* rt); /** * Set the HostResolveImportedModule hook for the runtime to the given function. */ extern JS_PUBLIC_API void SetModuleResolveHook(JSRuntime* rt, ModuleResolveHook func); using ModuleMetadataHook = bool (*)(JSContext*, Handle, Handle); /** * Get the hook for populating the import.meta metadata object. */ extern JS_PUBLIC_API ModuleMetadataHook GetModuleMetadataHook(JSRuntime* rt); /** * Set the hook for populating the import.meta metadata object to the given * function. */ extern JS_PUBLIC_API void SetModuleMetadataHook(JSRuntime* rt, ModuleMetadataHook func); using ModuleDynamicImportHook = bool (*)(JSContext* cx, Handle referencingPrivate, Handle specifier, Handle promise); /** * Get the HostImportModuleDynamically hook for the runtime. */ extern JS_PUBLIC_API ModuleDynamicImportHook GetModuleDynamicImportHook(JSRuntime* rt); /** * Set the HostImportModuleDynamically hook for the runtime to the given * function. * * If this hook is not set (or set to nullptr) then the JS engine will throw an * exception if dynamic module import is attempted. */ extern JS_PUBLIC_API void SetModuleDynamicImportHook( JSRuntime* rt, ModuleDynamicImportHook func); /** * Passed to FinishDynamicModuleImport to indicate the result of the dynamic * import operation. */ enum class DynamicImportStatus { Failed = 0, Ok }; /** * This must be called after a dynamic import operation is complete. * * If |evaluationPromise| is rejected, the rejection reason will be used to * complete the user's promise. */ extern JS_PUBLIC_API bool FinishDynamicModuleImport( JSContext* cx, Handle evaluationPromise, Handle referencingPrivate, Handle specifier, Handle promise); /** * This must be called after a dynamic import operation is complete. * * This is used so that Top Level Await functionality can be turned off * entirely. It will be removed in bug#1676612. * * If |status| is Failed, any pending exception on the context will be used to * complete the user's promise. */ extern JS_PUBLIC_API bool FinishDynamicModuleImport_NoTLA( JSContext* cx, DynamicImportStatus status, Handle referencingPrivate, Handle specifier, Handle promise); /** * Parse the given source buffer as a module in the scope of the current global * of cx and return a source text module record. */ extern JS_PUBLIC_API JSObject* CompileModule( JSContext* cx, const ReadOnlyCompileOptions& options, SourceText& srcBuf); /** * Parse the given source buffer as a module in the scope of the current global * of cx and return a source text module record. An error is reported if a * UTF-8 encoding error is encountered. */ extern JS_PUBLIC_API JSObject* CompileModule( JSContext* cx, const ReadOnlyCompileOptions& options, SourceText& srcBuf); /** * Set a private value associated with a source text module record. */ extern JS_PUBLIC_API void SetModulePrivate(JSObject* module, const Value& value); /** * Get the private value associated with a source text module record. */ extern JS_PUBLIC_API Value GetModulePrivate(JSObject* module); /* * Perform the ModuleInstantiate operation on the given source text module * record. * * This transitively resolves all module dependencies (calling the * HostResolveImportedModule hook) and initializes the environment record for * the module. */ extern JS_PUBLIC_API bool ModuleInstantiate(JSContext* cx, Handle moduleRecord); /* * Perform the ModuleEvaluate operation on the given source text module record * and returns a bool. A result value is returned in result and is either * undefined (and ignored) or a promise (if Top Level Await is enabled). * * If this module has already been evaluated, it returns the evaluation * promise. Otherwise, it transitively evaluates all dependences of this module * and then evaluates this module. * * ModuleInstantiate must have completed prior to calling this. */ extern JS_PUBLIC_API bool ModuleEvaluate(JSContext* cx, Handle moduleRecord, MutableHandleValue rval); /* * If a module evaluation fails, unwrap the resulting evaluation promise * and rethrow. * * This does nothing if this module succeeds in evaluation. Otherwise, it * takes the reason for the module throwing, unwraps it and throws it as a * regular error rather than as an uncaught promise. * * ModuleEvaluate must have completed prior to calling this. */ extern JS_PUBLIC_API bool ThrowOnModuleEvaluationFailure( JSContext* cx, Handle evaluationPromise); /* * Get a list of the module specifiers used by a source text module * record to request importation of modules. * * The result is a JavaScript array of object values. To extract the individual * values use only JS::GetArrayLength and JS_GetElement with indices 0 to length * - 1. * * The element values are objects with the following properties: * - moduleSpecifier: the module specifier string * - lineNumber: the line number of the import in the source text * - columnNumber: the column number of the import in the source text * * These property values can be extracted with GetRequestedModuleSpecifier() and * GetRequestedModuleSourcePos() */ extern JS_PUBLIC_API JSObject* GetRequestedModules( JSContext* cx, Handle moduleRecord); extern JS_PUBLIC_API JSString* GetRequestedModuleSpecifier( JSContext* cx, Handle requestedModuleObject); extern JS_PUBLIC_API void GetRequestedModuleSourcePos( JSContext* cx, Handle requestedModuleObject, uint32_t* lineNumber, uint32_t* columnNumber); /* * Get the top-level script for a module which has not yet been executed. */ extern JS_PUBLIC_API JSScript* GetModuleScript(Handle moduleRecord); } // namespace JS #endif // js_Modules_h